Copying Autobooting Dc Games

Please help a dummy.
I have copied dc (ready backed-up Hahah £5 from manchester computer show ) dreamcast games, none booting using 80mins discs in nero 5 , with great sucess.
But i had a quick go at . a autobooting Dc game , and it was just dected as audio cd so i am told. please help... i asumme that just tweeking a few setting in nero should do it

so how do i copy a autobooting dc games.


many thanks penfold